SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7222ef63b9c0c63809b1bc20306143608dfa5688f8c56afa77e259aa0735b939' 
  AND token = 'UcZx8nFKCN+76P/kaT4yHY5pGD/pXhmLXVv2HVxGJvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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