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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dffd94087931a3c2b58a54f17d38731cf7ed17908d2e0228cfac7879648d8d6' 
  AND token = '/0envoe4ASGtCuwUh7bEERiP5FTsX9evFzeoHSkN/5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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