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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a773a92851b86cee4fee7b64a593e9ef82aafc6982daae9daa29c30bf8ad6d' 
  AND token = 'hf8XM+oj/1if+LsPkgEt1UiglKyCOlguYG2o9fSTxMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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