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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8c6a1993850b60d1156f3ce4887de11cdb430b0c668a55095a2eed0e4b312a' 
  AND token = 'kJUq0oYKRdPKPA+UmtlnxifyKtbPq+An6NP6V/upRVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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