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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd7c15cccf753d3933c75d9ada8f91472e322dd5f0a8aae733be9549d074c95' 
  AND token = 'ZlLdvNW9AsxJnFkteMcVB69IpOauZS9M8tYnzXeha3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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