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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9363d5c81af61875e336c244525f21c9aae6f027e5633ccb42487b61a25967e4' 
  AND token = 'ma3/52UPP7P22nV2lWH24eO+X67858WBnQm3o/9Xp7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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