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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd5f7393dbc63d8e3264deec6849db463a376a948240d70c66f02105b2666af' 
  AND token = 'dhVydfbylLVj2RWpzf8STR0T27DFpm0Y/iA4bjTW9/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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