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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d15e016f30cf4e2bd9808fc3231dcb33fd75af2b96dffeb7a84d9706448ddc' 
  AND token = '6+/kynaoFCWJZ57/wbu20wCjyxQGPc+w3l+DlwBQc6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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