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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803dbd6d770bd719753e57147d8d0f4e2937631a656469f0ba44024c3a644762' 
  AND token = 'YPJRE9EIlBh1Dob+WGiTpnlbt1cmRo2+EJyvA7N53uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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