SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632aa66f27dc4546773e458cdc3dbc6ff443774c69a4e080d2dd4db1c1e2826d' 
  AND token = 't7cLbzFghmCZR+Db+Z0k5KEqr5KzVDTvjKLi27qnl+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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