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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569cc516849fc0e35bfd361a755d877cd2afd55823073fb8a7ee283277e41c68' 
  AND token = '1ugKBL3ivUh+Wc9bDfvxZ8KcL4CUAh0eCeVNvVnKZNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}