Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9a0c0199ae9a6d8420a8526d259df395352712c1d394ce9bb9153661e9736f' 
  AND token = '4fhTBgTcvzygLflkHEWXZ0dcgrc5ySpWHUdc1W9igeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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