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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ee4658430ee17fe8f3cdd377d7135a4713c5ec4acb6a12ae39c82a17e9a72a' 
  AND token = '3HmrsB4Rqy6mObPynitwjpU7Gvo8Fvp6GS35MODo4E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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