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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30dccd6a79477d971d2fb743407d377b57924a1b1fb09e7e96b18032831b54f' 
  AND token = 'g93/BViv3+vKpQkx+cFaROFW+zfh5OkOjix2bviREeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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