SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da69a3b1ce35d8fd21f137f939a1e546deb486bf6c211a2d499733ed7c62e220' 
  AND token = 'tREQ5LyDJTPHOpumKcK1Ps4LvA0GFKjZruMjqiq/Bs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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