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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbad1b5dda8ceece1d9bc4ab2456d6aaf11a650cc70727afb7eda94f861a669d' 
  AND token = '8YzkqrJxUA6IoEl/PhRhe+PJ17W40guY0lxRTlcEhNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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