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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107357e3323e56627e7ff36b663cd3b8610665d063f915ea77d9c31f5842647c' 
  AND token = 'BDs0B6LMZhPk90R7QgnIZ2DgRf1tdgjqW10N6Pz6Z5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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