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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47ac8d4cde6977488578284713027286cd25373702346d6ef3af19338363a9f' 
  AND token = 'BdNODcEH1wA7n75u8CvDZB5oYejdfJw1mlHDkYB5hHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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