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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d8261ad35f95b216c38a32d2d9c714f1bc181698143a6b0720446029563305' 
  AND token = '065NRY3tzRVZMX3GX0Mbn36yItPzFh/Nxe9qBDQI6WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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