SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05492d80cb2be3aaf1a875107189feb5e29342fec928112572e80d78ca37daee' 
  AND token = 'RfNLtqMjiW+Vz/69GIdfEr7gDPlx/aZr/vuXYquA1vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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