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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46bd1ca5ce525ff0d13cd7986877cbca9a792ed80eff2478dd5fadfb1332bb40' 
  AND token = 'vhpbnmlcQ67UGzE41Kfh9W2KI4X4c9c5AGqesSLwTyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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