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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0690b5e4561036db6280c2a71a8b489d1cb3f35212446c5cf32ff3153a47b75' 
  AND token = '0xpHK9M5NpBSeVA/mfrRKglQ7Pdj84C196FnGoiFysQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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