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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3243082b4de0404011306a94ddb8c4acfe77bf6223bffabf5a32571ecae317d' 
  AND token = 'ydSkjBEp8XS0MsuZF2ChH8KgJ4V8Mu8JQm6KDqMQvHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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