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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e3bcb49e57ea9bd79b19a7dd4ae266ff78f35ece17e3d11ef7c13d2766bf96' 
  AND token = 'DtPVybCCkAUvJ3oScDWrbrXbh/FmBYUWGHD0GFZ9ljY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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