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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683a4b857e65a4c0d524abd74cd0eeff91bbf0d4385d957259c4564ac2cd8cf7' 
  AND token = 'N7BZMVNlcdai9AYBkRydgrTQCVbuCqugE1EYun646e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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