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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b82cafa2b6923e3a708d873a04a6f8d5f7a5d4970345e6fc6890fdb39243f6' 
  AND token = 'bUJy5pPNjVnOwTgCooTRO4rkQCcN3tV94RUZzeE6QaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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