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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcd76d341e5080c453b626469bdede65a7e79afeafaf232bac9472d7eb9164c' 
  AND token = 'v3SldBVHZycxhWjTV6tzRDbSxsu5v8RqFonbB3IzEjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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