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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367b370719891a92c7c836149c863bf0af3c2799a7e52faba0efd7875cef0801' 
  AND token = 'olT5eiDW9pbTf3HTlp0EaL66VTQeIwIB0RhMawy3P/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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