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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9fe84b95d8ad4edf1d35e63611bbb769bf9c74999120c76d1c7a156322477e' 
  AND token = '5nRv9t4PruwcAl6Aly8u2GdNqd9UQSST0vjcHgjRnyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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