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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a90ab332c724ddc8c628407ea03fd381441a50c7961291c8b73a05317cb57d' 
  AND token = 'jrnBLR6Op3ui034vfegV+DxEwn3L89ZwIKjZadBI/Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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