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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f83b20f40dc61aef42ca13aebfa70ba26aa42b003f48bd076fd95fb2d4af4eb' 
  AND token = 'S+7VqWbePfmMWkEYAxE6pAvpi/kos+33X8zI3d5lsv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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