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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4676b96183e5d9255e9fe507471b6ff66307b4a92d9907f61f636b6c09b9e43d' 
  AND token = '8shWb03Y9wHXux4cTLpPFnM4ib0iut49qiaEveaBmgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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