SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72e4663fcc1d06b3caf4f2679f3fc584f404a2eb03ca296168009d9ec5a0b95' 
  AND token = 'vLayt+HHFU+zgs8PG5qbWpJPMSthu/3hmd2BbSJ5bCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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