SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5dcab14269e1f438d64debc2d24352ca716fa464bff1432fa61ab6f4c5b86e' 
  AND token = 'G3GVSJ1QpRhoYPYWqIxX2BGCXzP/LblTLc2Yh79/kzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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