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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040dec7f4d6916ed82d8d2817ecb2e8c30a4931f60dc080bfdbe1f22e554d46c' 
  AND token = 'ivGJdJdshhIUsseJ5YymL2NEesqoo6YAVuB13N2b6Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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