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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f2ef7598b59c5072434743fa7a8eeb68f4911335cc3d83a7ac0cebcd47cb9b' 
  AND token = 'yH6Q8LTEg0lMFNa8ryBWDkWEvzCGJ5ebAInKmC5Be8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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