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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee9c6d65c35a843ff954e379b8d2cd8a6cfc24ec926bbb9bf596b1fb2dd4127' 
  AND token = '9jRNM6aEHkUkUrhT+7wPAQSU8wLst8bWexS7dTwjgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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