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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae5cc7fd43d77d75b50a3a9ae420c803acc48e630914ac4a764cedab0d1f52c' 
  AND token = 'VwARp6rnM4LWls/yuCFU7aGoaLUpxuA9xTPVEJukt1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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