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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0986b74569f7dfe9bbb68ba41ea243f56628daa8408c414f8dc6f42b34f71206' 
  AND token = 'H+pG1ZDAcPWaJaLbrQfOPVwQ6qHxhth3iSbyZ7a2fEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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