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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53a618f3fd0e811ba9882dca84f35fc02c09e4ff1f9b8b7fa4a025624095f79' 
  AND token = '6Lm61nIzFG0byTSvGyhUncKKxuf/2aXwUrLjTqJRW4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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