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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6f650c10d7be42f8527b1c43e4068ce80b638679b9224654db7cda61246eef' 
  AND token = 'N9u34faDCv5wm6T2nGok8egkghZKYiC9cK2opcNoun8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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