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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa96cbaa4865f05e30991acdcd6c325c97e1bb71ea59aa54dccc18014110af63' 
  AND token = 'hUJlmzq/7cK9Soy8LPP+hQDQ//V2W7lTLatzTevJDwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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