SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a525b4b3577163cbff72463e2cb5c4c0d284738f2700681bb8673624918c1cd9' 
  AND token = 'tl8AloXP6PhZcZdq/Py6syRBZVuyRwGk2mmRCB/QtFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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