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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958eb45e195888aea4b03b41b36e64908b379fbbca55cc2eef39d93c14c03372' 
  AND token = 'QWh0L8yeB25PIX8b6Ah5BE6S49QEeShumaPLbmfB1yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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