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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2639904c29d76e89b3cfaea3996c0e1f81c4d274c19f58f175acec56fdd3cd3' 
  AND token = '0QSuHD3cjvYiVsI0XN8FsF6MkoXZpVxlNWHdqeXiD+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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