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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eff006313e9f57f7926b959fb591e2a56171b636f01d9381ca4f5908c55d48a' 
  AND token = 'TDSYkJYKuQayOYbRgT91i9cDcAkDBMrgr+lAwlpIigA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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