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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4688ec68ad6fe90dcd382ca5ab6a8efd562bbe6a054d1ec2d48ffedb5c0b72' 
  AND token = 'cCpYxW7lmndqhIXEmYhBhV7W2hC6l/rub9WfJB9Utck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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