SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f3c9ef93b3b52954d696a44945d42733ca9ec7f21b3b9080141913a2685e5b' 
  AND token = 'ZDBsPhkChqSqv5SV+W4xCw5/MF18YjWofl59p1gKqT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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