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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a044f672ed329dd63a1bd55b7668821452d9f28198d76167a7005295b969929e' 
  AND token = 'dLlltc2V3CZbeob7wOB5uw9w7HwNKx8055/KVvQfdn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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