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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44a14956d6292ecfe914edbbe1dc226e22478eee145a4db4b9f3188c8f811c5' 
  AND token = 'Hvk73aTH5F1jGGeCI/xryFvYp3BXKpy3EWP3IRqq7SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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