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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e3868f906ec2affbe104294fd22d9c44e9ff0e8bb8f7f23bb464ef161760b8' 
  AND token = 'qOMaS2wyY4xgljdLhvDWfOzWoXLqbzPteUGBtxoUaZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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