SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd05f573e157ba87dd3fa07543851f7948ca19b96bb182772b41fc25e4d013ac' 
  AND token = 'XsuzJgyL28VGKM9h78fNQ4jeMYA+cQKbgm16gOZhxds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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