SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae233e3786603ca2def77549d5a481b49b1abd8f74f18932c19f7749088b5b0' 
  AND token = '13IvKdWmxQvY0OqjFZGR0UlY1ra6m10DWZDTyHJmRPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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