SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111e35fc1c12c53a4655d843c476df6259c39a1de937029947ed7c2195d9b07' 
  AND token = 'v6DlzWHCQaYw8qNKxaRp7h6PmFOueVg7gCYprZwJ9kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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