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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d20e74c054d84d57496631ecc55a7068a6cc54784ce559fbfa277fc4fda3783' 
  AND token = 'jIROuX4yTN84WbAL6a7i0z6gGJ3Kc++suwBey8iM/yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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