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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd09a5ca4e332d0d0a199d124f2673ef7e0cae520f5c3481d41d086b7d098a6' 
  AND token = 'EhRoeFZ/2yyBmOxe3lfhkT1QOWtBGonIJhCwke2hxOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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