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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7dbb7c881d25119cdc8faa99b7d752d31b0dc87a4c09b024cb1b46331f57d5' 
  AND token = 'FAaqII1XyuPxBf5xcZmC8o7MLvu2hsp5NCsAS0UazQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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