SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7b76392bb3154f84576c6b20a3c2176ac9bc5e1a41e3cf8dfef8e9f521afdb' 
  AND token = 'uvLKxAu/oiuIwyNR5+GwT6+2pJnQAiUWOxG0jO+/lRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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