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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd0664b7834c61a85f0c0da1a18a42d98bfc4d0ebaeabab87ccad4dff357cd4' 
  AND token = 'rMXaXC0dwJm9Yn9Gw8NRoRl5tnK+4irQh7ss96NH3io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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