SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbe6f5e3d69d07f5a72899bbebadc9b6a3a6345a91ec58096c471fb0094cf5d' 
  AND token = '/XP/qz2MkTFMWJLodzNuG+YZCrRoxh+R3tci1xiKFyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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