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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09354a41fb48e28a2f176838794e73fddea24db6ee6e75c0e325060dc61113f' 
  AND token = 'UCuIjM5ORL0/7frrxG7FyKY0cf2BgtkVdIT8sUvb6Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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