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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db84ee2ae3304c4f110b21803e245f59f5418b0ae5c8c656cd3d44a592c3f89' 
  AND token = 'jMAu24Gsso0VBvRqAq39Z4G5/kBofK/8/tJ5fXECanM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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