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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed579064cd3e54715219324062ab09bea47b22ae99f2793f978352f8dedbe2b' 
  AND token = 'yXqxXuabjOkrSyu6gZd89n3v62C29DWfVi7+vikMq0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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