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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15ccd7a595ba14edd59cba8c35d7833a158a12eaf4d94822cef99e874444ef0' 
  AND token = 'CyTgPHjeiCvU1PfHn+NLlyp/Sxd1v9Y0jpBC8FG8ywI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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