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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9a2eb4b7b1f1c17ccd1e5c995ee10e50a19ade2d962207d63e863b66ea2dab' 
  AND token = 'LyXlcnUWXP+8UWY2RQJ/MeEYastOwvHKfDILfLpK6p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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