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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef1525cb08e96993ac31b0299fe9af849ec4f0a0966e3c3aa031e08f0070ce6' 
  AND token = '3xlPTe9FE+LjT86BU/cCEtHoOHcjO9FnkceWai9QTJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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