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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd731f7e0acd181e1ee43939e63a638cb95e6246462c99ebda7930151596924c1' 
  AND token = 'pE+p/bmwxJwRGNf6ufOR8gsKp7RMQWr9bsStxM0Ti6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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