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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac84310eda74db7ffbfef84f613c71980e422fd29240c01a6454a9efb587334' 
  AND token = 'jjiVummm5xj4sbYxqu/8sSqQIhXiL7xqixd+oUkY7K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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