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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36c5f5629205e3ef2d2807abc021dfa93aa7e8f4a58ef1ee84c4d070c8246ab' 
  AND token = 'D4Jrr2/6e3vdDT0w3wsp3VUc7cP7IDcd3vwlRMJQXgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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