SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bafa4aec88326a25351cbc8f0e9004f6d19d8d89184bba1816e2c61a106ad9' 
  AND token = '9WzhkVWTSNKfgyqyLyBzwgArGHiNlie8fZVB3Xj5NvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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