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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71af6cd7a6be37c7fa0bc28dcc0f332eda90c79feffcab3242cad40ff6074b25' 
  AND token = 'YlJzHWOuVZEdgi0/fdG7NIX8XQWlldSvk2gwKAhCaMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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