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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ac7279688aa079288968d0f8ed8022cbfb8a83e4efdcc13a8bee37cac0a8c9' 
  AND token = 'xQnrNXWUCHXwV3/nhN8Mhjl039fyPEBxO7I/HVj4pco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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