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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69036a1a7f216a5d45d81ac27d9f6f5892349acb684ec36a917f0e3c61acee55' 
  AND token = 'FazAuaI0LEGAeZtm0vp7VmSAxIoZCBSgK78oxftzc88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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