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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce67c80bb67623fdaa333b196641529dba30281243330e43866547585912639' 
  AND token = 'hPzrE7SFANyYZ6RtLkl/DiMml0WbxXlOkWdJP5B2O88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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