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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815d2cd3e3fa00e9330a6fcbb820ccbd308f8971774ff7b8e7b09aa3dd35afaa' 
  AND token = 'H+oeW+fpowruuY4xJoVgp+om7fsUtyW35bftGyjHBu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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