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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6db8c58c0c4f36a1f5f8fd9e64a6f1998b205e71ec348b6f0bb87fd42e9d32' 
  AND token = 'Jo+wHKiYWc8jh8xHmLKy4gNI2fuoN5G117GdBT3HPeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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