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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd51b84e0e490517328e656bf8ceafd09a6701ad7c7e4cd01858d42645061cce' 
  AND token = 'sPKMY2uAAPNdj9oHgCfNISR6LAC3s80xwkarn94uEJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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