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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cdcda1af77cbef979904419d316d001cc599202df1021ca204eb821dd8da6f' 
  AND token = 'N1mjQzjWbaIqvz10pw+S2f30EfpWnO3whYkd+OiBNhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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