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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce96a3cabcf2054db8de97813dbf1bde5945ca5dfe9d5e4a3de9cd1494293cf' 
  AND token = 'AZb5AKOqu0MqQ8OiD4Z3bYJtB9tgNNiuw4MNe7fv/2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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