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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ddd811c1e26055a4500afc99bbaf1a34cac2fa95788a53ea6878bee0057499' 
  AND token = 'MCcw3hO3wuuL8LeT6GbO2lAQ0VFmnErGhyF1+8MR27c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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