SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518d30344c21e9a86184c95652e6af9f17ab61a8d2fb39a5b0e0cbcb62cf6dae' 
  AND token = 'YPghwE68hJLtBcZAwaliYarOhJqFjPH/YVH72MfqnLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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