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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd647574452ce7e14fb376ab360bd0a12cae2123cd015b1262ca1768b9b7089fe' 
  AND token = '7Iso+PfEbgfDOCmmdjeePh9hns/aLZ35SvagX4vdzf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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