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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46947e0fe725ab7f83efd9786e28897fdab542e2ec554edac3be0295ea1ecdb0' 
  AND token = 'RMmu/trAne0bSvhs5WIJdl8IQszbfS9s5DmHVDkC4Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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