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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d5c08557900224492d6ac08d819254c4378232380bfb6ed376a21339305670' 
  AND token = 'zbSDJabSigT4K7uUIdy2Rw+M+hE9k5louAP54SJB9+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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