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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6a20f01eb506391df2067b1e9ef74f04b991d44935ab6103acc21395447a9c' 
  AND token = 'ub5UiQO60YoORh6zWJBNLJ6yhjMd+7wDzwFm5/c3hqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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