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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6d2d08b6b481e337c0b5f1ef3cc64daf4d34799acdec84b138395ba8fca3ec' 
  AND token = 'I6jfFrwZTW40sMXIoMf1BkDP8xU3AIZ4Sz8Kz57Kd0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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