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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1feb4f859e38dcd98708068b7c28e0fb73e77d913559d9ae1678e2febd58ca7c' 
  AND token = 'v7NsFyr9YOdr/+HhgviN/w+LWc4m8/Npc0k/hIBKIOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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