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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d92219e0659649fe6f62f7e16d70f557d078487052cb39c870ce3c4e88b8416' 
  AND token = 'v8dkvx2MapR3fG2mVXrIHKcVzq/EEW9pnNjT89EIlxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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