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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924e66fa81db9f98391d3d88c6c9e0ab68ecda19c6b853c48b16c02067e9a3e2' 
  AND token = 'bm63/Nb5An1CNVJBNFiZDVc4qUJnvN7lUThlkCAALHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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