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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c299b3b88f095457f62ec288e1712628bd734fbe3a6341e9b469f0f7ef6d44d1' 
  AND token = '2Lsrv4B6Qkg4gXsaHYMq0ysuMU8zhB1d577D9asTPvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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