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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a632e2a817694a43c2644040e3b50f0855423492f43bb7732a22919274b970' 
  AND token = 'eXx74t25at8OC7wN+Yx4+jrC9jNhrpjfOL94www8MLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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