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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd108b379ca13ef8163017abba867aaa532629e3cfe66d828e3234d6c5b89b57d' 
  AND token = 'Wvd6h/U7YTOUAPfEciaBg3lLWBdhJwXgFsab11YYhtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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