SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac743462f30ed96922fd72af29a7e55414aa50b773fcd0e48d5c9676c01331c' 
  AND token = 'lmg48wOyWGVVTaFlAgJzKX2qhQuK0sC2Qb7rL9b3bVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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