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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e772f2358ea45ca29a3284b9adaa9c6eecf28eb2280678c56786548fe7b7a55' 
  AND token = '2iQcUSPidu9uZME8WQ11mtXGlRxDdAxHG6C3SKKsALA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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