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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516b9ce0b467e8ffebc60c1b258b0055d21e64a165ef365bdfc154620978db9f' 
  AND token = 'pgT+H7gvHXgr4oExgCnTL7fexWlLh1Baqp/Ztsahcgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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