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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ba747775af7f1c34a7ef49370d0c51715d972a264b0d95412b9ffcc628ed11' 
  AND token = '4c0/eRQq48ufjM5Wlh2p4qyv44fQ5X5GZnVrs2H+L6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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