SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418a63a1b51df0ff37614e63e6bddd437ffe2d80ce2a1f88c2cc9607855b12bc' 
  AND token = 'sYtt/mx+zbINHYk/h1QzqSQBZketltvRKR8rCoj93lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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