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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9254ca29188a87f3131b427adb0cbf4235cbd997b7ae1d87cc68233bf842ac' 
  AND token = 'IAHtRmv9BLe78f4XPT0P+F0amwqNdH4MpV1gGZCB1g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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