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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c5e2ead35672d95c539628ae6c463bbc0bfb1679878aa83ccc162056ca5f74' 
  AND token = 'ubvHzm6w23qdP9fQs0AV51dNjfmkXiAblL+xD3PQfz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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