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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abab3503d5c4b0e54cf140a49b49f0dc2804450cd35397f3416d819c0dec38f' 
  AND token = 'Zolb6M/eQxmHQqQ8SfDVP+oasTtNsAFjOuKCZ+kpBYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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