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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803d23cb32d05b58799f87ba60c0b5e2259e8f882f6424230654221b80ce8963' 
  AND token = 'c4SQnt8eJUpzHp8h93a5cOjhThARhi1QkNEHEczSuRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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