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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccc177ff1be2a8a1fcc51eefb0a3b96e1a7061efb6804f7d1b6da4e4cafb17c' 
  AND token = 'fxEKf5FYmWrW1QgEjhNK/2fEFP81c6kxtInucb9yzg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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